*{
    margin: 0;
    padding: 0;
}
a{
    text-decoration: none;
}
#header{
    height: 50px;
    width: 100%;
    background-color: darkgrey;
}
#header p{
    line-height: 50px;
    font-size: 18px;
}
#userDic{
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0,0,0,0.2);
}
#user{
    border-radius: 15px;
    width: 400px;
    height: 240px;
    background-color: cadetblue;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -120px;
    margin-left: -200px;
}
#spanUser {
    text-align: center;
    margin-top: 30px;
    margin-bottom: 30px;
    display: inline-block;
    width: 100px;
    font-size: 18px;
    line-height: 40px;
}
#spanPwd{
    text-align: center;
    margin-top: 30px;
    margin-bottom: 40px;
    display: inline-block;
    width: 100px;
    font-size: 18px;
    line-height: 40px;
}
#userInp{
    margin-top: 30px;
    margin-bottom: 30px;
    margin-left: 15px;
    width: 200px;
    height: 30px;
}
#pwdInp{
    margin-left: 15px;
    width: 200px;
    height: 30px;
}
#zhuce{
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0,0,0,0.2)
}
#creDiv{
    border-radius: 15px;
    width: 400px;
    height: 240px;
    background-color: cadetblue;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -120px;
    margin-left: -200px;
}
#creUser{
    text-align: center;
    margin-top: 30px;
    margin-bottom: 30px;
    display: inline-block;
    width: 100px;
    font-size: 18px;
    line-height: 40px;
}
#crePwn {
    text-align: center;
    margin-top: 30px;
    margin-bottom: 30px;
    display: inline-block;
    width: 100px;
    font-size: 18px;
    line-height: 40px;
}
#createUsername{
    margin-top: 30px;
    margin-bottom: 30px;
    margin-left: 15px;
    width: 200px;
    height:30px;
}
#createPwd{
    margin-left: 15px;
    width: 200px;
    height: 30px;
}